Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Relativistic theory of low energy electron diffraction
In view of investigating the role of spin polarization and further relativistic effects in the diffraction of low energy electrons (LEED) by crystals composed of heavy atoms, a relativistic dynamical theory is developed for calculating LEED intensities and spin polarizations. The presentation of the...
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Department of Physics
2016
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867614066119278592 |
|---|---|
| access_status_str | Open Access |
| author | Feder, Roland |
| author2 | Schaffer, Alfred |
| author_browse | Feder, Roland Schaffer, Alfred |
| author_facet | Schaffer, Alfred Feder, Roland |
| author_sort | Feder, Roland |
| collection | Thesis |
| description | In view of investigating the role of spin polarization and further relativistic effects in the diffraction of low energy electrons (LEED) by crystals composed of heavy atoms, a relativistic dynamical theory is developed for calculating LEED intensities and spin polarizations. The presentation of the general framework of solving the boundary value problem for the mixed-representation Dirac equation is followed by the construction of a relativistic KKRZ-type electron-ion-core pseudopotential. The solution of the Dirac equation inside a model crystal that consists of this potential plus a bulk and surf ace optical potential is then derived in an algebraic form. Provision is made for taking into account thermal lattice effects. The computational application of this relativistic LEED theory to the (ool) and the (llo) surface pf tungsten firstly yields intensity results that are found to be in good agreement with experimental data. Secondly, appreciable spin polarization features are predicted, in particular in the specular beam for large angles of incidence on W(ool) at very low energies. It is concluded that measurement of spin polarization in LEED can be expected to be a valuable tool for obtaining additional information about the surface region. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/17737 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:46:07.817Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Physics |
| publisherStr | Department of Physics |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/17737 Relativistic theory of low energy electron diffraction Feder, Roland Schaffer, Alfred Frahn, W E Physics In view of investigating the role of spin polarization and further relativistic effects in the diffraction of low energy electrons (LEED) by crystals composed of heavy atoms, a relativistic dynamical theory is developed for calculating LEED intensities and spin polarizations. The presentation of the general framework of solving the boundary value problem for the mixed-representation Dirac equation is followed by the construction of a relativistic KKRZ-type electron-ion-core pseudopotential. The solution of the Dirac equation inside a model crystal that consists of this potential plus a bulk and surf ace optical potential is then derived in an algebraic form. Provision is made for taking into account thermal lattice effects. The computational application of this relativistic LEED theory to the (ool) and the (llo) surface pf tungsten firstly yields intensity results that are found to be in good agreement with experimental data. Secondly, appreciable spin polarization features are predicted, in particular in the specular beam for large angles of incidence on W(ool) at very low energies. It is concluded that measurement of spin polarization in LEED can be expected to be a valuable tool for obtaining additional information about the surface region. 2016-03-14T07:25:52Z 2016-03-14T07:25:52Z 1973 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/17737 eng application/pdf Department of Physics Faculty of Science University of Cape Town |
| spellingShingle | Physics Feder, Roland Relativistic theory of low energy electron diffraction |
| thesis_degree_str | Doctoral |
| title | Relativistic theory of low energy electron diffraction |
| title_full | Relativistic theory of low energy electron diffraction |
| title_fullStr | Relativistic theory of low energy electron diffraction |
| title_full_unstemmed | Relativistic theory of low energy electron diffraction |
| title_short | Relativistic theory of low energy electron diffraction |
| title_sort | relativistic theory of low energy electron diffraction |
| topic | Physics |
| url | http://hdl.handle.net/11427/17737 |
| work_keys_str_mv | AT federroland relativistictheoryoflowenergyelectrondiffraction |